/*
    *  Licensed to the Apache Software Foundation (ASF) under one
    *  or more contributor license agreements.  See the NOTICE file
    *  distributed with this work for additional information
    *  regarding copyright ownership.  The ASF licenses this file
    *  to you under the Apache License, Version 2.0 (the
    *  "License"); you may not use this file except in compliance
    *  with the License.  You may obtain a copy of the License at
    *
   *    http://www.apache.org/licenses/LICENSE-2.0
   *
   *  Unless required by applicable law or agreed to in writing,
   *  software distributed under the License is distributed on an
   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   *  KIND, either express or implied.  See the License for the
   *  specific language governing permissions and limitations
   *  under the License.
   *
   */
  package org.apache.mina.transport.socket;
  
  import java.net.DatagramSocket;
  import java.net.SocketException;
  
  import org.apache.mina.util.ExceptionMonitor;
  
  /**
   * A default implementation of {@link DatagramSessionConfig}.
   *
   * @author The Apache MINA Project (dev@mina.apache.org)
   * @version $Rev: 439913 $, $Date: 2006-09-04 05:12:43 +0200 (mån, 04 sep 2006) $
   */
  public class DefaultDatagramSessionConfig extends AbstractDatagramSessionConfig {
  
      private static boolean SET_RECEIVE_BUFFER_SIZE_AVAILABLE = false;
      private static boolean SET_SEND_BUFFER_SIZE_AVAILABLE = false;
      private static boolean GET_TRAFFIC_CLASS_AVAILABLE = false;
      private static final boolean SET_TRAFFIC_CLASS_AVAILABLE = false;
      private static boolean DEFAULT_BROADCAST = false;
      private static boolean DEFAULT_REUSE_ADDRESS = false;
      private static int DEFAULT_RECEIVE_BUFFER_SIZE = 1024;
      private static int DEFAULT_SEND_BUFFER_SIZE = 1024;
      private static int DEFAULT_TRAFFIC_CLASS = 0;
  
      static {
          initialize();
      }
  
      private static void initialize() {
          DatagramSocket socket = null;
  
          try {
              socket = new DatagramSocket();
              DEFAULT_BROADCAST = socket.getBroadcast();
              DEFAULT_REUSE_ADDRESS = socket.getReuseAddress();
              DEFAULT_RECEIVE_BUFFER_SIZE = socket.getReceiveBufferSize();
              DEFAULT_SEND_BUFFER_SIZE = socket.getSendBufferSize();
  
              // Check if setReceiveBufferSize is supported.
              try {
                  socket.setReceiveBufferSize(DEFAULT_RECEIVE_BUFFER_SIZE);
                  SET_RECEIVE_BUFFER_SIZE_AVAILABLE = true;
              } catch (SocketException e) {
                  SET_RECEIVE_BUFFER_SIZE_AVAILABLE = false;
              }
  
              // Check if setSendBufferSize is supported.
              try {
                  socket.setSendBufferSize(DEFAULT_SEND_BUFFER_SIZE);
                  SET_SEND_BUFFER_SIZE_AVAILABLE = true;
              } catch (SocketException e) {
                  SET_SEND_BUFFER_SIZE_AVAILABLE = false;
              }
  
              // Check if getTrafficClass is supported.
              try {
                  DEFAULT_TRAFFIC_CLASS = socket.getTrafficClass();
                  GET_TRAFFIC_CLASS_AVAILABLE = true;
              } catch (SocketException e) {
                  GET_TRAFFIC_CLASS_AVAILABLE = false;
                  DEFAULT_TRAFFIC_CLASS = 0;
              }
          } catch (SocketException e) {
              ExceptionMonitor.getInstance().exceptionCaught(e);
          } finally {
              if (socket != null) {
                  socket.close();
              }
          }
      }
  
      public static boolean isSetReceiveBufferSizeAvailable() {
          return SET_RECEIVE_BUFFER_SIZE_AVAILABLE;
      }
  
      public static boolean isSetSendBufferSizeAvailable() {
          return SET_SEND_BUFFER_SIZE_AVAILABLE;
      }
  
     public static boolean isGetTrafficClassAvailable() {
         return GET_TRAFFIC_CLASS_AVAILABLE;
     }
 
     public static boolean isSetTrafficClassAvailable() {
         return SET_TRAFFIC_CLASS_AVAILABLE;
     }
 
     private boolean broadcast = DEFAULT_BROADCAST;
     private boolean reuseAddress = DEFAULT_REUSE_ADDRESS;
     private int receiveBufferSize = DEFAULT_RECEIVE_BUFFER_SIZE;
     private int sendBufferSize = DEFAULT_SEND_BUFFER_SIZE;
     private int trafficClass = DEFAULT_TRAFFIC_CLASS;
     
     /**
      * Creates a new instance.
      */
     public DefaultDatagramSessionConfig() {
     }
 
     /**
      * @see DatagramSocket#getBroadcast()
      */
     public boolean isBroadcast() {
         return broadcast;
     }
 
     /**
      * @see DatagramSocket#setBroadcast(boolean)
      */
     public void setBroadcast(boolean broadcast) {
         this.broadcast = broadcast;
     }
 
     /**
      * @see DatagramSocket#getReuseAddress()
      */
     public boolean isReuseAddress() {
         return reuseAddress;
     }
 
     /**
      * @see DatagramSocket#setReuseAddress(boolean)
      */
     public void setReuseAddress(boolean reuseAddress) {
         this.reuseAddress = reuseAddress;
     }
 
     /**
      * @see DatagramSocket#getReceiveBufferSize()
      */
     public int getReceiveBufferSize() {
         return receiveBufferSize;
     }
 
     /**
      * @see DatagramSocket#setReceiveBufferSize(int)
      */
     public void setReceiveBufferSize(int receiveBufferSize) {
         this.receiveBufferSize = receiveBufferSize;
     }
 
     /**
      * @see DatagramSocket#getSendBufferSize()
      */
     public int getSendBufferSize() {
         return sendBufferSize;
     }
 
     /**
      * @see DatagramSocket#setSendBufferSize(int)
      */
     public void setSendBufferSize(int sendBufferSize) {
         this.sendBufferSize = sendBufferSize;
     }
 
     /**
      * @see DatagramSocket#getTrafficClass()
      */
     public int getTrafficClass() {
         return trafficClass;
     }
 
     /**
      * @see DatagramSocket#setTrafficClass(int)
      */
     public void setTrafficClass(int trafficClass) {
         this.trafficClass = trafficClass;
     }
 
     @Override
     protected boolean isBroadcastChanged() {
         return broadcast != DEFAULT_BROADCAST;
     }
 
     @Override
     protected boolean isReceiveBufferSizeChanged() {
         return receiveBufferSize != DEFAULT_RECEIVE_BUFFER_SIZE;
     }
 
     @Override
     protected boolean isReuseAddressChanged() {
         return reuseAddress != DEFAULT_REUSE_ADDRESS;
     }
 
     @Override
     protected boolean isSendBufferSizeChanged() {
         return sendBufferSize != DEFAULT_SEND_BUFFER_SIZE;
     }
 
     @Override
     protected boolean isTrafficClassChanged() {
         return trafficClass != DEFAULT_TRAFFIC_CLASS;
     }
     
 }